What baud rate characterizes HART when coexisting with the analog signal on the same loop?

Study for the HART Protocol and 4–20 mA Loop Communication Test. Utilize flashcards and multiple-choice questions, with each question offering hints and explanations. Get ready for your exam!

Multiple Choice

What baud rate characterizes HART when coexisting with the analog signal on the same loop?

Explanation:
HART sends digital data by riding it on top of the 4-20 mA analog loop using two frequencies (FSK). The digital channel uses tones around 1 kHz and 2 kHz, and the data rate is 1200 baud. This rate was chosen to fit within the loop’s bandwidth and keep the analog signal clean over typical wiring and noise conditions. Higher speeds would require more bandwidth and could distort the analog signal, while slower speeds would be unnecessarily limiting. So, on the same loop, the standard baud rate for HART is 1200 baud.

HART sends digital data by riding it on top of the 4-20 mA analog loop using two frequencies (FSK). The digital channel uses tones around 1 kHz and 2 kHz, and the data rate is 1200 baud. This rate was chosen to fit within the loop’s bandwidth and keep the analog signal clean over typical wiring and noise conditions. Higher speeds would require more bandwidth and could distort the analog signal, while slower speeds would be unnecessarily limiting. So, on the same loop, the standard baud rate for HART is 1200 baud.

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